Improve the water resistance of cosmetic compositions comprising pigments

Abstract

The present invention relates to the increase of water resistance of cosmetic compositions which comprise pigments. This is achieved by the combined use of a mixture of branched and linear saturated C15-C19 alkanes; and an ester of a fatty acid and dextrin.

1 . A cosmetic composition comprising
 a mixture of branched and linear saturated C15-C19 alkanes; and   an ester of a fatty acid and dextrin; and   a pigment   wherein the amount of branched saturated C15-C19 alkane in said mixture of branched and linear saturated C15-C19 alkanes is more than 80% by weight, preferably more that 90% by weight, most preferred more than 92% by weight.   
     
     
         2 . The cosmetic composition according to  claim 1 , wherein the amount of linear saturated C15-C19 alkanes in said mixture of branched and linear saturated C15-C19 alkanes is less than 10% by weight, preferably less than 8% by weight, most preferred more than 5% by weight. 
     
     
         3 . The cosmetic composition according to  claim 1 , wherein the amount of branched saturated C18 alkane is more than 50% by weight, preferably more than 60% by weight, even more preferably more than 70% by weight, relative to the weight of said mixture of branched and linear saturated C15-C19 alkanes. 
     
     
         4 . The cosmetic composition according to  claim 1 , wherein the fatty acid of said ester of a fatty acid and dextrin is a C14-C18 fatty acid, particularly a linear C14-C18 fatty acid, most preferably palmitic acid. 
     
     
         5 . The cosmetic composition according to  claim 1 , wherein the dextrin of said ester of a fatty acid and dextrin has an average degree of glycopolymerization of between 3 and 20, particularly between 8 and 16. 
     
     
         6 . The cosmetic composition according to  claim 1 , wherein said ester of a fatty acid and dextrin has an average number of esterified hydroxyl groups of more than 2.5, preferably between 2.5 and 3.5, more preferably between 2.5 and 3.4, most preferably between 2.5 and 3.2, per glucose unit. 
     
     
         7 . The cosmetic composition according to  claim 1 , wherein said ester of a fatty acid and dextrin has a molecular weight M n  of between 8′000 and 16′000 Da, preferably between 9′000 and 13′000 Da, more preferably between 10′000 and 11′500 Da. 
     
     
         8 . The cosmetic composition according to  claim 1 , wherein the pigment is an inorganic pigment, particularly an inorganic pigment with a colour index between CI 77000 and CI 77999. 
     
     
         9 . The cosmetic composition according to  claim 1 , wherein the pigment is selected from the group consisting of CI 15850, CI 17200, CI 45370, CI 73360, CI 75470, CI 77007, CI 77013, CI 77019, CI 77120, CI 77163, CI 77266, CI 77288, CI 77289, CI 77480, CI 77491, CI 77492, CI 77499, CI 77510, CI 77713, CI 77742, CI 77820, CI 77891, CI 77947 and char coal powder, particularly selected from the group consisting of CI 15850, CI 77491, CI 77492, CI 77499, CI 77510 and CI 77891 and char coal powder. 
     
     
         10 . The cosmetic composition according to  claim 1 , wherein the amount of pigment is in the range of between 0.001 and 15% by weight, particularly between 0.01 and 12% by weight, preferably between 0.05 and 10% by weight, based on the weight of the cosmetic composition. 
     
     
         11 . The cosmetic composition according to  claim 1 , wherein the amount of the mixture of branched and linear saturated C15-C19 alkanes is in the range of between 0.5 and 12.0% by weight, particularly between 1.0 and 10.0% by weight, more preferably between 1.5 and 8.0% by weight, preferably between 2.0 and 6.0% by weight, based on the weight of the cosmetic composition. 
     
     
         12 . The cosmetic composition according to  claim 1 , wherein the cosmetic composition is a decorative cosmetic composition, particularly a lip gloss, a lip ink, a lip stick, a makeup, a foundation, a mascara, an eye liner, an eye shadow, a liquid blush, an eyebrow liner, a concealer, a highlighter or contouring shade. 
     
     
         13 . Use of a mixture of branched and linear saturated C15-C19 alkanes, in combination with an ester of a fatty acid and dextrin for increasing the water resistance of a cosmetic composition comprising a pigment. 
     
     
         14 . The use according to  claim 13 , wherein the cosmetic composition comprising a pigment is a decorative cosmetic composition, particularly a lip gloss, a lip ink, a lip stick, a makeup, a foundation, a mascara, an eye liner, an eye shadow, a liquid blush, an eyebrow liner, a concealer, a highlighter or contouring shade.